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- Committer: Teddy Hogeborn
- Date: 2011-11-27 02:32:20 UTC
- mto: (505.2.10 mandos-client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 525.
- Revision ID: teddy@recompile.se-20111127023220-bih6el7s0q6jhtci
* debian/mandos-client.README.Debian: Document network hook facility.
* debian/mandos-client.docs (network-hooks.d): Added.
* initramfs-tools-hook: Also pass VERBOSITY to network hook.
* plugins.d/mandos-client.xml (DESCRIPTION): Document network
interface selection
algorithm.
(OPTIONS/--interface): Refer to NETWORK HOOKS section.
(OVERVIEW): Refer to password-prompt(8mandos) explicitly.
(NETWORK HOOKS): New section.
(FILES): Add "/lib/mandos/network-hooks.d".
* debian/mandos-client.docs (network-hooks.d): Added.
* initramfs-tools-hook: Also pass VERBOSITY to network hook.
* plugins.d/mandos-client.xml (DESCRIPTION): Document network
interface selection
algorithm.
(OPTIONS/--interface): Refer to NETWORK HOOKS section.
(OVERVIEW): Refer to password-prompt(8mandos) explicitly.
(NETWORK HOOKS): New section.
(FILES): Add "/lib/mandos/network-hooks.d".
- files removed:
- debian/mandos-client.examples
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
59
getnameinfo() */
58
inet_pton(), connect() */
60
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
61
*/
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno,
66
66
program_invocation_short_name */
67
67
#include <time.h> /* nanosleep(), time(), sleep() */
73
73
*/
74
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
78
#include <iso646.h> /* not, or, and */
79
79
#include <argp.h> /* struct argp_option, error_t, struct
80
80
argp_state, struct argp,
87
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
#include <argz.h> /* argz_add_sep(), argz_next(),
92
argz_delete(), argz_append(),
93
argz_stringify(), argz_add(),
94
argz_count() */
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
97
90
98
91
#ifdef __linux__
99
92
#include <sys/klog.h> /* klogctl() */
141
134
static const char sys_class_net[] = "/sys/class/net";
142
135
char *connect_to = NULL;
143
136
const char *hookdir = HOOKDIR;
144
uid_t uid = 65534;
145
gid_t gid = 65534;
146
137
147
138
/* Doubly linked list that need to be circularly linked when used */
148
139
typedef struct server{
149
140
const char *ip;
150
in_port_t port;
141
uint16_t port;
151
142
AvahiIfIndex if_index;
152
143
int af;
153
144
struct timespec last_seen;
157
148
158
149
/* Used for passing in values through the Avahi callback functions */
159
150
typedef struct {
151
AvahiSimplePoll *simple_poll;
160
152
AvahiServer *server;
161
153
gnutls_certificate_credentials_t cred;
162
154
unsigned int dh_bits;
164
156
const char *priority;
165
157
gpgme_ctx_t ctx;
166
158
server *current_server;
167
char *interfaces;
168
size_t interfaces_size;
169
159
} mandos_context;
170
160
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
173
166
174
167
sig_atomic_t quit_now = 0;
175
168
int signal_received = 0;
176
169
177
170
/* Function to use when printing errors */
178
171
void perror_plus(const char *print_text){
179
int e = errno;
180
172
fprintf(stderr, "Mandos plugin %s: ",
181
173
program_invocation_short_name);
182
errno = e;
183
174
perror(print_text);
184
175
}
185
176
186
__attribute__((format (gnu_printf, 2, 3)))
187
177
int fprintf_plus(FILE *stream, const char *format, ...){
188
178
va_list ap;
189
179
va_start (ap, format);
190
180
191
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
182
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
194
184
}
195
185
196
186
/*
201
191
size_t incbuffer(char **buffer, size_t buffer_length,
202
192
size_t buffer_capacity){
203
193
if(buffer_length + BUFFER_SIZE > buffer_capacity){
204
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
if(new_buf == NULL){
206
int old_errno = errno;
207
free(*buffer);
208
errno = old_errno;
209
*buffer = NULL;
194
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
195
if(buffer == NULL){
210
196
return 0;
211
197
}
212
*buffer = new_buf;
213
198
buffer_capacity += BUFFER_SIZE;
214
199
}
215
200
return buffer_capacity;
216
201
}
217
202
218
203
/* Add server to set of servers to retry periodically */
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
220
int af, server **current_server){
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
int af){
221
206
int ret;
222
207
server *new_server = malloc(sizeof(server));
223
208
if(new_server == NULL){
224
209
perror_plus("malloc");
225
return false;
210
return -1;
226
211
}
227
212
*new_server = (server){ .ip = strdup(ip),
228
213
.port = port,
230
215
.af = af };
231
216
if(new_server->ip == NULL){
232
217
perror_plus("strdup");
233
return false;
234
}
235
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
236
if(ret == -1){
237
perror_plus("clock_gettime");
238
return false;
218
return -1;
239
219
}
240
220
/* Special case of first server */
241
if(*current_server == NULL){
221
if (mc.current_server == NULL){
242
222
new_server->next = new_server;
243
223
new_server->prev = new_server;
244
*current_server = new_server;
224
mc.current_server = new_server;
245
225
/* Place the new server last in the list */
246
226
} else {
247
new_server->next = *current_server;
248
new_server->prev = (*current_server)->prev;
227
new_server->next = mc.current_server;
228
new_server->prev = mc.current_server->prev;
249
229
new_server->prev->next = new_server;
250
(*current_server)->prev = new_server;
251
}
252
return true;
230
mc.current_server->prev = new_server;
231
}
232
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
233
if(ret == -1){
234
perror_plus("clock_gettime");
235
return -1;
236
}
237
return 0;
253
238
}
254
239
255
240
/*
256
241
* Initialize GPGME.
257
242
*/
258
243
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
244
const char *tempdir){
260
245
gpgme_error_t rc;
261
246
gpgme_engine_info_t engine_info;
262
247
248
263
249
/*
264
250
* Helper function to insert pub and seckey to the engine keyring.
265
251
*/
281
267
return false;
282
268
}
283
269
284
rc = gpgme_op_import(mc->ctx, pgp_data);
270
rc = gpgme_op_import(mc.ctx, pgp_data);
285
271
if(rc != GPG_ERR_NO_ERROR){
286
272
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
287
273
gpgme_strsource(rc), gpgme_strerror(rc));
331
317
}
332
318
333
319
/* Create new GPGME "context" */
334
rc = gpgme_new(&(mc->ctx));
320
rc = gpgme_new(&(mc.ctx));
335
321
if(rc != GPG_ERR_NO_ERROR){
336
322
fprintf_plus(stderr, "Mandos plugin mandos-client: "
337
323
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
352
338
*/
353
339
static ssize_t pgp_packet_decrypt(const char *cryptotext,
354
340
size_t crypto_size,
355
char **plaintext,
356
mandos_context *mc){
341
char **plaintext){
357
342
gpgme_data_t dh_crypto, dh_plain;
358
343
gpgme_error_t rc;
359
344
ssize_t ret;
385
370
386
371
/* Decrypt data from the cryptotext data buffer to the plaintext
387
372
data buffer */
388
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
389
374
if(rc != GPG_ERR_NO_ERROR){
390
375
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
391
376
gpgme_strsource(rc), gpgme_strerror(rc));
392
377
plaintext_length = -1;
393
378
if(debug){
394
379
gpgme_decrypt_result_t result;
395
result = gpgme_op_decrypt_result(mc->ctx);
380
result = gpgme_op_decrypt_result(mc.ctx);
396
381
if(result == NULL){
397
382
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
398
383
} else {
476
461
}
477
462
478
463
static const char * safer_gnutls_strerror(int value){
479
const char *ret = gnutls_strerror(value);
464
const char *ret = gnutls_strerror(value); /* Spurious warning from
465
-Wunreachable-code */
480
466
if(ret == NULL)
481
467
ret = "(unknown)";
482
468
return ret;
489
475
}
490
476
491
477
static int init_gnutls_global(const char *pubkeyfilename,
492
const char *seckeyfilename,
493
mandos_context *mc){
478
const char *seckeyfilename){
494
479
int ret;
495
480
496
481
if(debug){
513
498
}
514
499
515
500
/* OpenPGP credentials */
516
ret = gnutls_certificate_allocate_credentials(&mc->cred);
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
517
502
if(ret != GNUTLS_E_SUCCESS){
518
503
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
519
504
safer_gnutls_strerror(ret));
529
514
}
530
515
531
516
ret = gnutls_certificate_set_openpgp_key_file
532
(mc->cred, pubkeyfilename, seckeyfilename,
517
(mc.cred, pubkeyfilename, seckeyfilename,
533
518
GNUTLS_OPENPGP_FMT_BASE64);
534
519
if(ret != GNUTLS_E_SUCCESS){
535
520
fprintf_plus(stderr,
541
526
}
542
527
543
528
/* GnuTLS server initialization */
544
ret = gnutls_dh_params_init(&mc->dh_params);
529
ret = gnutls_dh_params_init(&mc.dh_params);
545
530
if(ret != GNUTLS_E_SUCCESS){
546
531
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
547
532
" initialization: %s\n",
548
533
safer_gnutls_strerror(ret));
549
534
goto globalfail;
550
535
}
551
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
552
537
if(ret != GNUTLS_E_SUCCESS){
553
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
554
539
safer_gnutls_strerror(ret));
555
540
goto globalfail;
556
541
}
557
542
558
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
543
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
559
544
560
545
return 0;
561
546
562
547
globalfail:
563
548
564
gnutls_certificate_free_credentials(mc->cred);
549
gnutls_certificate_free_credentials(mc.cred);
565
550
gnutls_global_deinit();
566
gnutls_dh_params_deinit(mc->dh_params);
551
gnutls_dh_params_deinit(mc.dh_params);
567
552
return -1;
568
553
}
569
554
570
static int init_gnutls_session(gnutls_session_t *session,
571
mandos_context *mc){
555
static int init_gnutls_session(gnutls_session_t *session){
572
556
int ret;
573
557
/* GnuTLS session creation */
574
558
do {
586
570
{
587
571
const char *err;
588
572
do {
589
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
590
574
if(quit_now){
591
575
gnutls_deinit(*session);
592
576
return -1;
603
587
604
588
do {
605
589
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
606
mc->cred);
590
mc.cred);
607
591
if(quit_now){
608
592
gnutls_deinit(*session);
609
593
return -1;
619
603
/* ignore client certificate if any. */
620
604
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
621
605
622
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
606
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
623
607
624
608
return 0;
625
609
}
629
613
__attribute__((unused)) const char *txt){}
630
614
631
615
/* Called when a Mandos server is found */
632
static int start_mandos_communication(const char *ip, in_port_t port,
616
static int start_mandos_communication(const char *ip, uint16_t port,
633
617
AvahiIfIndex if_index,
634
int af, mandos_context *mc){
618
int af){
635
619
int ret, tcp_sd = -1;
636
620
ssize_t sret;
637
struct sockaddr_storage to;
621
union {
622
struct sockaddr_in in;
623
struct sockaddr_in6 in6;
624
} to;
638
625
char *buffer = NULL;
639
626
char *decrypted_buffer = NULL;
640
627
size_t buffer_length = 0;
664
651
return -1;
665
652
}
666
653
667
/* If the interface is specified and we have a list of interfaces */
668
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
669
/* Check if the interface is one of the interfaces we are using */
670
bool match = false;
671
{
672
char *interface = NULL;
673
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
674
interface))){
675
if(if_nametoindex(interface) == (unsigned int)if_index){
676
match = true;
677
break;
678
}
679
}
680
}
681
if(not match){
682
/* This interface does not match any in the list, so we don't
683
connect to the server */
684
if(debug){
685
char interface[IF_NAMESIZE];
686
if(if_indextoname((unsigned int)if_index, interface) == NULL){
687
perror_plus("if_indextoname");
688
} else {
689
fprintf_plus(stderr, "Skipping server on non-used interface"
690
" \"%s\"\n",
691
if_indextoname((unsigned int)if_index,
692
interface));
693
}
694
}
695
return -1;
696
}
697
}
698
699
ret = init_gnutls_session(&session, mc);
654
ret = init_gnutls_session(&session);
700
655
if(ret != 0){
701
656
return -1;
702
657
}
703
658
704
659
if(debug){
705
660
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
706
PRIuMAX "\n", ip, (uintmax_t)port);
661
PRIu16 "\n", ip, port);
707
662
}
708
663
709
664
tcp_sd = socket(pf, SOCK_STREAM, 0);
721
676
722
677
memset(&to, 0, sizeof(to));
723
678
if(af == AF_INET6){
724
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
725
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
679
to.in6.sin6_family = (sa_family_t)af;
680
ret = inet_pton(af, ip, &to.in6.sin6_addr);
726
681
} else { /* IPv4 */
727
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
682
to.in.sin_family = (sa_family_t)af;
683
ret = inet_pton(af, ip, &to.in.sin_addr);
729
684
}
730
685
if(ret < 0 ){
731
686
int e = errno;
740
695
goto mandos_end;
741
696
}
742
697
if(af == AF_INET6){
743
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
744
if(IN6_IS_ADDR_LINKLOCAL
745
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
698
to.in6.sin6_port = htons(port); /* Spurious warnings from
699
-Wconversion and
700
-Wunreachable-code */
701
702
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
703
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
704
-Wunreachable-code*/
746
705
if(if_index == AVAHI_IF_UNSPEC){
747
706
fprintf_plus(stderr, "An IPv6 link-local address is"
748
707
" incomplete without a network interface\n");
750
709
goto mandos_end;
751
710
}
752
711
/* Set the network interface number as scope */
753
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
712
to.in6.sin6_scope_id = (uint32_t)if_index;
754
713
}
755
714
} else {
756
((struct sockaddr_in *)&to)->sin_port = htons(port);
715
to.in.sin_port = htons(port); /* Spurious warnings from
716
-Wconversion and
717
-Wunreachable-code */
757
718
}
758
719
759
720
if(quit_now){
767
728
if(if_indextoname((unsigned int)if_index, interface) == NULL){
768
729
perror_plus("if_indextoname");
769
730
} else {
770
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
771
"\n", ip, interface, (uintmax_t)port);
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
772
733
}
773
734
} else {
774
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
775
ip, (uintmax_t)port);
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
776
737
}
777
738
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
778
739
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
740
const char *pcret;
779
741
if(af == AF_INET6){
780
ret = getnameinfo((struct sockaddr *)&to,
781
sizeof(struct sockaddr_in6),
782
addrstr, sizeof(addrstr), NULL, 0,
783
NI_NUMERICHOST);
742
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
743
sizeof(addrstr));
784
744
} else {
785
ret = getnameinfo((struct sockaddr *)&to,
786
sizeof(struct sockaddr_in),
787
addrstr, sizeof(addrstr), NULL, 0,
788
NI_NUMERICHOST);
745
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
746
sizeof(addrstr));
789
747
}
790
if(ret == EAI_SYSTEM){
791
perror_plus("getnameinfo");
792
} else if(ret != 0) {
793
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
794
} else if(strcmp(addrstr, ip) != 0){
795
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
748
if(pcret == NULL){
749
perror_plus("inet_ntop");
750
} else {
751
if(strcmp(addrstr, ip) != 0){
752
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
753
}
796
754
}
797
755
}
798
756
802
760
}
803
761
804
762
if(af == AF_INET6){
805
ret = connect(tcp_sd, (struct sockaddr *)&to,
806
sizeof(struct sockaddr_in6));
763
ret = connect(tcp_sd, &to.in6, sizeof(to));
807
764
} else {
808
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
809
sizeof(struct sockaddr_in));
765
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
810
766
}
811
767
if(ret < 0){
812
768
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
861
817
goto mandos_end;
862
818
}
863
819
864
/* This casting via intptr_t is to eliminate warning about casting
865
an int to a pointer type. This is exactly how the GnuTLS Guile
866
function "set-session-transport-fd!" does it. */
867
gnutls_transport_set_ptr(session,
868
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
869
822
870
823
if(quit_now){
871
824
errno = EINTR;
976
929
if(buffer_length > 0){
977
930
ssize_t decrypted_buffer_size;
978
931
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
979
&decrypted_buffer, mc);
932
&decrypted_buffer);
980
933
if(decrypted_buffer_size >= 0){
981
934
982
935
written = 0;
1043
996
AVAHI_GCC_UNUSED AvahiStringList *txt,
1044
997
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1045
998
flags,
1046
void* mc){
1047
if(r == NULL){
1048
return;
1049
}
999
AVAHI_GCC_UNUSED void* userdata){
1000
assert(r);
1050
1001
1051
1002
/* Called whenever a service has been resolved successfully or
1052
1003
timed out */
1061
1012
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1062
1013
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1063
1014
domain,
1064
avahi_strerror(avahi_server_errno
1065
(((mandos_context*)mc)->server)));
1015
avahi_strerror(avahi_server_errno(mc.server)));
1066
1016
break;
1067
1017
1068
1018
case AVAHI_RESOLVER_FOUND:
1074
1024
PRIdMAX ") on port %" PRIu16 "\n", name,
1075
1025
host_name, ip, (intmax_t)interface, port);
1076
1026
}
1077
int ret = start_mandos_communication(ip, (in_port_t)port,
1078
interface,
1079
avahi_proto_to_af(proto),
1080
mc);
1027
int ret = start_mandos_communication(ip, port, interface,
1028
avahi_proto_to_af(proto));
1081
1029
if(ret == 0){
1082
avahi_simple_poll_quit(simple_poll);
1030
avahi_simple_poll_quit(mc.simple_poll);
1083
1031
} else {
1084
if(not add_server(ip, (in_port_t)port, interface,
1085
avahi_proto_to_af(proto),
1086
&((mandos_context*)mc)->current_server)){
1087
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1088
" list\n", name);
1089
}
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
1090
1034
}
1091
1035
}
1092
1036
}
1102
1046
const char *domain,
1103
1047
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1104
1048
flags,
1105
void* mc){
1106
if(b == NULL){
1107
return;
1108
}
1049
AVAHI_GCC_UNUSED void* userdata){
1050
assert(b);
1109
1051
1110
1052
/* Called whenever a new services becomes available on the LAN or
1111
1053
is removed from the LAN */
1119
1061
case AVAHI_BROWSER_FAILURE:
1120
1062
1121
1063
fprintf_plus(stderr, "(Avahi browser) %s\n",
1122
avahi_strerror(avahi_server_errno
1123
(((mandos_context*)mc)->server)));
1124
avahi_simple_poll_quit(simple_poll);
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
avahi_simple_poll_quit(mc.simple_poll);
1125
1066
return;
1126
1067
1127
1068
case AVAHI_BROWSER_NEW:
1130
1071
the callback function is called the Avahi server will free the
1131
1072
resolver for us. */
1132
1073
1133
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1134
interface, protocol, name, type,
1135
domain, protocol, 0,
1136
resolve_callback, mc) == NULL)
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
resolve_callback, NULL) == NULL)
1137
1077
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1138
1078
" %s\n", name,
1139
avahi_strerror(avahi_server_errno
1140
(((mandos_context*)mc)->server)));
1079
avahi_strerror(avahi_server_errno(mc.server)));
1141
1080
break;
1142
1081
1143
1082
case AVAHI_BROWSER_REMOVE:
1162
1101
signal_received = sig;
1163
1102
int old_errno = errno;
1164
1103
/* set main loop to exit */
1165
if(simple_poll != NULL){
1166
avahi_simple_poll_quit(simple_poll);
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1167
1106
}
1168
1107
errno = old_errno;
1169
1108
}
1170
1109
1171
1110
bool get_flags(const char *ifname, struct ifreq *ifr){
1172
1111
int ret;
1173
error_t ret_errno;
1174
1112
1175
1113
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1176
1114
if(s < 0){
1177
ret_errno = errno;
1178
1115
perror_plus("socket");
1179
errno = ret_errno;
1180
1116
return false;
1181
1117
}
1182
1118
strcpy(ifr->ifr_name, ifname);
1183
1119
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1184
1120
if(ret == -1){
1185
1121
if(debug){
1186
ret_errno = errno;
1187
1122
perror_plus("ioctl SIOCGIFFLAGS");
1188
errno = ret_errno;
1189
1123
}
1190
1124
return false;
1191
1125
}
1260
1194
}
1261
1195
1262
1196
/*
1263
* This function determines if a network interface is up.
1264
*/
1265
bool interface_is_up(const char *interface){
1266
struct ifreq ifr;
1267
if(not get_flags(interface, &ifr)){
1268
if(debug){
1269
fprintf_plus(stderr, "Failed to get flags for interface "
1270
"\"%s\"\n", interface);
1271
}
1272
return false;
1273
}
1274
1275
return (bool)(ifr.ifr_flags & IFF_UP);
1276
}
1277
1278
/*
1279
* This function determines if a network interface is running
1280
*/
1281
bool interface_is_running(const char *interface){
1282
struct ifreq ifr;
1283
if(not get_flags(interface, &ifr)){
1284
if(debug){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1287
}
1288
return false;
1289
}
1290
1291
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1203
return 0;
1204
}
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1219
if_entry->d_name);
1220
}
1221
return 0;
1222
}
1223
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1228
if_entry->d_name);
1229
}
1230
return 0;
1231
}
1232
1233
if(not good_flags(if_entry->d_name, &ifr)){
1234
return 0;
1235
}
1236
return 1;
1292
1237
}
1293
1238
1294
1239
int notdotentries(const struct dirent *direntry){
1363
1308
return 1;
1364
1309
}
1365
1310
1366
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1367
mandos_context *mc){
1311
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1368
1312
int ret;
1369
1313
struct timespec now;
1370
1314
struct timespec waited_time;
1371
1315
intmax_t block_time;
1372
1316
1373
1317
while(true){
1374
if(mc->current_server == NULL){
1318
if(mc.current_server == NULL){
1375
1319
if (debug){
1376
1320
fprintf_plus(stderr, "Wait until first server is found."
1377
1321
" No timeout!\n");
1391
1335
/* Calculating in ms how long time between now and server
1392
1336
who we visted longest time ago. Now - last seen. */
1393
1337
waited_time.tv_sec = (now.tv_sec
1394
- mc->current_server->last_seen.tv_sec);
1338
- mc.current_server->last_seen.tv_sec);
1395
1339
waited_time.tv_nsec = (now.tv_nsec
1396
- mc->current_server->last_seen.tv_nsec);
1340
- mc.current_server->last_seen.tv_nsec);
1397
1341
/* total time is 10s/10,000ms.
1398
1342
Converting to s from ms by dividing by 1,000,
1399
1343
and ns to ms by dividing by 1,000,000. */
1407
1351
}
1408
1352
1409
1353
if(block_time <= 0){
1410
ret = start_mandos_communication(mc->current_server->ip,
1411
mc->current_server->port,
1412
mc->current_server->if_index,
1413
mc->current_server->af, mc);
1354
ret = start_mandos_communication(mc.current_server->ip,
1355
mc.current_server->port,
1356
mc.current_server->if_index,
1357
mc.current_server->af);
1414
1358
if(ret == 0){
1415
avahi_simple_poll_quit(s);
1359
avahi_simple_poll_quit(mc.simple_poll);
1416
1360
return 0;
1417
1361
}
1418
1362
ret = clock_gettime(CLOCK_MONOTONIC,
1419
&mc->current_server->last_seen);
1363
&mc.current_server->last_seen);
1420
1364
if(ret == -1){
1421
1365
perror_plus("clock_gettime");
1422
1366
return -1;
1423
1367
}
1424
mc->current_server = mc->current_server->next;
1368
mc.current_server = mc.current_server->next;
1425
1369
block_time = 0; /* Call avahi to find new Mandos
1426
1370
servers, but don't block */
1427
1371
}
1436
1380
}
1437
1381
}
1438
1382
1439
/* Set effective uid to 0, return errno */
1440
error_t raise_privileges(void){
1441
error_t old_errno = errno;
1442
error_t ret_errno = 0;
1443
if(seteuid(0) == -1){
1444
ret_errno = errno;
1445
perror_plus("seteuid");
1446
}
1447
errno = old_errno;
1448
return ret_errno;
1449
}
1450
1451
/* Set effective and real user ID to 0. Return errno. */
1452
error_t raise_privileges_permanently(void){
1453
error_t old_errno = errno;
1454
error_t ret_errno = raise_privileges();
1455
if(ret_errno != 0){
1456
errno = old_errno;
1457
return ret_errno;
1458
}
1459
if(setuid(0) == -1){
1460
ret_errno = errno;
1461
perror_plus("seteuid");
1462
}
1463
errno = old_errno;
1464
return ret_errno;
1465
}
1466
1467
/* Set effective user ID to unprivileged saved user ID */
1468
error_t lower_privileges(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = 0;
1471
if(seteuid(uid) == -1){
1472
ret_errno = errno;
1473
perror_plus("seteuid");
1474
}
1475
errno = old_errno;
1476
return ret_errno;
1477
}
1478
1479
/* Lower privileges permanently */
1480
error_t lower_privileges_permanently(void){
1481
error_t old_errno = errno;
1482
error_t ret_errno = 0;
1483
if(setuid(uid) == -1){
1484
ret_errno = errno;
1485
perror_plus("setuid");
1486
}
1487
errno = old_errno;
1488
return ret_errno;
1489
}
1490
1491
1383
bool run_network_hooks(const char *mode, const char *interface,
1492
1384
const float delay){
1493
1385
struct dirent **direntries;
1386
struct dirent *direntry;
1387
int ret;
1494
1388
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1495
1389
alphasort);
1496
1390
if(numhooks == -1){
1497
if(errno == ENOENT){
1498
if(debug){
1499
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1500
" found\n", hookdir);
1501
}
1502
} else {
1503
perror_plus("scandir");
1504
}
1391
perror_plus("scandir");
1505
1392
} else {
1506
struct dirent *direntry;
1507
int ret;
1508
1393
int devnull = open("/dev/null", O_RDONLY);
1509
1394
for(int i = 0; i < numhooks; i++){
1510
1395
direntry = direntries[i];
1521
1406
pid_t hook_pid = fork();
1522
1407
if(hook_pid == 0){
1523
1408
/* Child */
1524
/* Raise privileges */
1525
raise_privileges_permanently();
1526
/* Set group */
1527
errno = 0;
1528
ret = setgid(0);
1529
if(ret == -1){
1530
perror_plus("setgid");
1531
}
1532
/* Reset supplementary groups */
1533
errno = 0;
1534
ret = setgroups(0, NULL);
1535
if(ret == -1){
1536
perror_plus("setgroups");
1537
}
1538
1409
dup2(devnull, STDIN_FILENO);
1539
1410
close(devnull);
1540
1411
dup2(STDERR_FILENO, STDOUT_FILENO);
1541
1412
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1542
1413
if(ret == -1){
1543
1414
perror_plus("setenv");
1544
_exit(EX_OSERR);
1415
return false;
1545
1416
}
1546
1417
ret = setenv("DEVICE", interface, 1);
1547
1418
if(ret == -1){
1548
1419
perror_plus("setenv");
1549
_exit(EX_OSERR);
1420
return false;
1550
1421
}
1551
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1422
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1552
1423
if(ret == -1){
1553
1424
perror_plus("setenv");
1554
_exit(EX_OSERR);
1425
return false;
1555
1426
}
1556
1427
ret = setenv("MODE", mode, 1);
1557
1428
if(ret == -1){
1558
1429
perror_plus("setenv");
1559
_exit(EX_OSERR);
1430
return false;
1560
1431
}
1561
1432
char *delaystring;
1562
1433
ret = asprintf(&delaystring, "%f", delay);
1563
1434
if(ret == -1){
1564
1435
perror_plus("asprintf");
1565
_exit(EX_OSERR);
1436
return false;
1566
1437
}
1567
1438
ret = setenv("DELAY", delaystring, 1);
1568
1439
if(ret == -1){
1569
1440
free(delaystring);
1570
1441
perror_plus("setenv");
1571
_exit(EX_OSERR);
1442
return false;
1572
1443
}
1573
1444
free(delaystring);
1574
if(connect_to != NULL){
1575
ret = setenv("CONNECT", connect_to, 1);
1576
if(ret == -1){
1577
perror_plus("setenv");
1578
_exit(EX_OSERR);
1579
}
1580
}
1581
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1582
perror_plus("execl");
1583
_exit(EXIT_FAILURE);
1584
}
1445
ret = execl(fullname, direntry->d_name, mode, NULL);
1446
perror_plus("execl");
1585
1447
} else {
1586
1448
int status;
1587
1449
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1621
1483
return true;
1622
1484
}
1623
1485
1624
error_t bring_up_interface(const char *const interface,
1625
const float delay){
1626
int sd = -1;
1627
error_t old_errno = errno;
1628
error_t ret_errno = 0;
1629
int ret, ret_setflags;
1630
struct ifreq network;
1631
unsigned int if_index = if_nametoindex(interface);
1632
if(if_index == 0){
1633
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1634
errno = old_errno;
1635
return ENXIO;
1636
}
1637
1638
if(quit_now){
1639
errno = old_errno;
1640
return EINTR;
1641
}
1642
1643
if(not interface_is_up(interface)){
1644
if(not get_flags(interface, &network) and debug){
1645
ret_errno = errno;
1646
fprintf_plus(stderr, "Failed to get flags for interface "
1647
"\"%s\"\n", interface);
1648
return ret_errno;
1649
}
1650
network.ifr_flags |= IFF_UP;
1651
1652
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1653
if(sd < 0){
1654
ret_errno = errno;
1655
perror_plus("socket");
1656
errno = old_errno;
1657
return ret_errno;
1658
}
1659
1660
if(quit_now){
1661
close(sd);
1662
errno = old_errno;
1663
return EINTR;
1664
}
1665
1666
if(debug){
1667
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1668
interface);
1669
}
1670
1671
/* Raise priviliges */
1672
raise_privileges();
1673
1674
#ifdef __linux__
1675
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1676
messages about the network interface to mess up the prompt */
1677
int ret_linux = klogctl(8, NULL, 5);
1678
bool restore_loglevel = true;
1679
if(ret_linux == -1){
1680
restore_loglevel = false;
1681
perror_plus("klogctl");
1682
}
1683
#endif /* __linux__ */
1684
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1685
ret_errno = errno;
1686
#ifdef __linux__
1687
if(restore_loglevel){
1688
ret_linux = klogctl(7, NULL, 0);
1689
if(ret_linux == -1){
1690
perror_plus("klogctl");
1691
}
1692
}
1693
#endif /* __linux__ */
1694
1695
/* Lower privileges */
1696
lower_privileges();
1697
1698
/* Close the socket */
1699
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1700
if(ret == -1){
1701
perror_plus("close");
1702
}
1703
1704
if(ret_setflags == -1){
1705
errno = ret_errno;
1706
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1707
errno = old_errno;
1708
return ret_errno;
1709
}
1710
} else if(debug){
1711
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1712
interface);
1713
}
1714
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
1718
if(interface_is_running(interface)){
1719
break;
1720
}
1721
struct timespec sleeptime = { .tv_nsec = 250000000 };
1722
ret = nanosleep(&sleeptime, NULL);
1723
if(ret == -1 and errno != EINTR){
1724
perror_plus("nanosleep");
1725
}
1726
}
1727
1728
errno = old_errno;
1729
return 0;
1730
}
1731
1732
error_t take_down_interface(const char *const interface){
1733
error_t old_errno = errno;
1734
struct ifreq network;
1735
unsigned int if_index = if_nametoindex(interface);
1736
if(if_index == 0){
1737
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1738
errno = old_errno;
1739
return ENXIO;
1740
}
1741
if(interface_is_up(interface)){
1742
error_t ret_errno = 0;
1743
if(not get_flags(interface, &network) and debug){
1744
ret_errno = errno;
1745
fprintf_plus(stderr, "Failed to get flags for interface "
1746
"\"%s\"\n", interface);
1747
return ret_errno;
1748
}
1749
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1750
1751
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1752
if(sd < 0){
1753
ret_errno = errno;
1754
perror_plus("socket");
1755
errno = old_errno;
1756
return ret_errno;
1757
}
1758
1759
if(debug){
1760
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1761
interface);
1762
}
1763
1764
/* Raise priviliges */
1765
raise_privileges();
1766
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1768
ret_errno = errno;
1769
1770
/* Lower privileges */
1771
lower_privileges();
1772
1773
/* Close the socket */
1774
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1775
if(ret == -1){
1776
perror_plus("close");
1777
}
1778
1779
if(ret_setflags == -1){
1780
errno = ret_errno;
1781
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1782
errno = old_errno;
1783
return ret_errno;
1784
}
1785
} else if(debug){
1786
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1787
interface);
1788
}
1789
1790
errno = old_errno;
1791
return 0;
1792
}
1793
1794
1486
int main(int argc, char *argv[]){
1795
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1796
.priority = "SECURE256:!CTYPE-X.509:"
1797
"+CTYPE-OPENPGP", .current_server = NULL,
1798
.interfaces = NULL, .interfaces_size = 0 };
1799
1487
AvahiSServiceBrowser *sb = NULL;
1800
error_t ret_errno;
1488
int error;
1801
1489
int ret;
1802
1490
intmax_t tmpmax;
1803
1491
char *tmp;
1804
1492
int exitcode = EXIT_SUCCESS;
1805
char *interfaces_to_take_down = NULL;
1806
size_t interfaces_to_take_down_size = 0;
1493
const char *interface = "";
1494
struct ifreq network;
1495
int sd = -1;
1496
bool take_down_interface = false;
1497
uid_t uid;
1498
gid_t gid;
1807
1499
char tempdir[] = "/tmp/mandosXXXXXX";
1808
1500
bool tempdir_created = false;
1809
1501
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1810
1502
const char *seckey = PATHDIR "/" SECKEY;
1811
1503
const char *pubkey = PATHDIR "/" PUBKEY;
1812
char *interfaces_hooks = NULL;
1813
1504
1814
1505
bool gnutls_initialized = false;
1815
1506
bool gpgme_initialized = false;
1877
1568
.group = 2 },
1878
1569
{ .name = "retry", .key = 132,
1879
1570
.arg = "SECONDS",
1880
.doc = "Retry interval used when denied by the Mandos server",
1571
.doc = "Retry interval used when denied by the mandos server",
1881
1572
.group = 2 },
1882
1573
{ .name = "network-hook-dir", .key = 133,
1883
1574
.arg = "DIR",
1906
1597
connect_to = arg;
1907
1598
break;
1908
1599
case 'i': /* --interface */
1909
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1910
arg, (int)',');
1911
if(ret_errno != 0){
1912
argp_error(state, "%s", strerror(ret_errno));
1913
}
1600
interface = arg;
1914
1601
break;
1915
1602
case 's': /* --seckey */
1916
1603
seckey = arg;
1959
1646
argp_state_help(state, state->out_stream,
1960
1647
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1961
1648
case 'V': /* --version */
1649
fprintf_plus(state->out_stream,
1650
"Mandos plugin mandos-client: ");
1962
1651
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1963
1652
exit(argp_err_exit_status);
1964
1653
break;
1989
1678
}
1990
1679
}
1991
1680
1992
{
1681
if(getuid() == 0){
1993
1682
/* Work around Debian bug #633582:
1994
1683
<http://bugs.debian.org/633582> */
1684
struct stat st;
1995
1685
1996
1686
/* Re-raise priviliges */
1997
if(raise_privileges() == 0){
1998
struct stat st;
1999
2000
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2001
int seckey_fd = open(seckey, O_RDONLY);
2002
if(seckey_fd == -1){
2003
perror_plus("open");
2004
} else {
2005
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2006
if(ret == -1){
2007
perror_plus("fstat");
2008
} else {
2009
if(S_ISREG(st.st_mode)
2010
and st.st_uid == 0 and st.st_gid == 0){
2011
ret = fchown(seckey_fd, uid, gid);
2012
if(ret == -1){
2013
perror_plus("fchown");
2014
}
2015
}
2016
}
2017
TEMP_FAILURE_RETRY(close(seckey_fd));
2018
}
2019
}
2020
2021
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2022
int pubkey_fd = open(pubkey, O_RDONLY);
2023
if(pubkey_fd == -1){
2024
perror_plus("open");
2025
} else {
2026
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2027
if(ret == -1){
2028
perror_plus("fstat");
2029
} else {
2030
if(S_ISREG(st.st_mode)
2031
and st.st_uid == 0 and st.st_gid == 0){
2032
ret = fchown(pubkey_fd, uid, gid);
2033
if(ret == -1){
2034
perror_plus("fchown");
2035
}
2036
}
2037
}
2038
TEMP_FAILURE_RETRY(close(pubkey_fd));
2039
}
2040
}
2041
2042
/* Lower privileges */
2043
lower_privileges();
2044
}
2045
}
2046
2047
/* Remove invalid interface names (except "none") */
2048
{
2049
char *interface = NULL;
2050
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2051
interface))){
2052
if(strcmp(interface, "none") != 0
2053
and if_nametoindex(interface) == 0){
2054
if(interface[0] != '\0'){
2055
fprintf_plus(stderr, "Not using nonexisting interface"
2056
" \"%s\"\n", interface);
2057
}
2058
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2059
interface = NULL;
2060
}
1687
errno = 0;
1688
ret = seteuid(0);
1689
if(ret == -1){
1690
perror_plus("seteuid");
1691
}
1692
1693
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1694
int seckey_fd = open(seckey, O_RDONLY);
1695
if(seckey_fd == -1){
1696
perror_plus("open");
1697
} else {
1698
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1699
if(ret == -1){
1700
perror_plus("fstat");
1701
} else {
1702
if(S_ISREG(st.st_mode)
1703
and st.st_uid == 0 and st.st_gid == 0){
1704
ret = fchown(seckey_fd, uid, gid);
1705
if(ret == -1){
1706
perror_plus("fchown");
1707
}
1708
}
1709
}
1710
TEMP_FAILURE_RETRY(close(seckey_fd));
1711
}
1712
}
1713
1714
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1715
int pubkey_fd = open(pubkey, O_RDONLY);
1716
if(pubkey_fd == -1){
1717
perror_plus("open");
1718
} else {
1719
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1720
if(ret == -1){
1721
perror_plus("fstat");
1722
} else {
1723
if(S_ISREG(st.st_mode)
1724
and st.st_uid == 0 and st.st_gid == 0){
1725
ret = fchown(pubkey_fd, uid, gid);
1726
if(ret == -1){
1727
perror_plus("fchown");
1728
}
1729
}
1730
}
1731
TEMP_FAILURE_RETRY(close(pubkey_fd));
1732
}
1733
}
1734
1735
/* Lower privileges */
1736
errno = 0;
1737
ret = seteuid(uid);
1738
if(ret == -1){
1739
perror_plus("seteuid");
2061
1740
}
2062
1741
}
2063
1742
2064
1743
/* Run network hooks */
2065
1744
{
2066
if(mc.interfaces != NULL){
2067
interfaces_hooks = malloc(mc.interfaces_size);
2068
if(interfaces_hooks == NULL){
2069
perror_plus("malloc");
2070
goto end;
1745
if(getuid() == 0){
1746
/* Re-raise priviliges */
1747
errno = 0;
1748
ret = seteuid(0);
1749
if(ret == -1){
1750
perror_plus("seteuid");
2071
1751
}
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2074
1752
}
2075
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2076
interfaces_hooks : "", delay)){
1753
if(not run_network_hooks("start", interface, delay)){
2077
1754
goto end;
2078
1755
}
1756
if(getuid() == 0){
1757
/* Lower privileges */
1758
errno = 0;
1759
ret = seteuid(uid);
1760
if(ret == -1){
1761
perror_plus("seteuid");
1762
}
1763
}
2079
1764
}
2080
1765
2081
1766
if(not debug){
2082
1767
avahi_set_log_function(empty_log);
2083
1768
}
2084
1769
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1774
alphasort);
1775
if(ret == 0){
1776
/* No up interfaces, look for any good interfaces */
1777
free(direntries);
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1779
alphasort);
1780
}
1781
if(ret >= 1){
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1784
if(debug){
1785
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1786
}
1787
if(interface == NULL){
1788
perror_plus("malloc");
1789
free(direntries);
1790
exitcode = EXIT_FAILURE;
1791
goto end;
1792
}
1793
free(direntries);
1794
} else {
1795
free(direntries);
1796
fprintf_plus(stderr, "Could not find a network interface\n");
1797
exitcode = EXIT_FAILURE;
1798
goto end;
1799
}
1800
}
1801
2085
1802
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2086
1803
from the signal handler */
2087
1804
/* Initialize the pseudo-RNG for Avahi */
2088
1805
srand((unsigned int) time(NULL));
2089
simple_poll = avahi_simple_poll_new();
2090
if(simple_poll == NULL){
1806
mc.simple_poll = avahi_simple_poll_new();
1807
if(mc.simple_poll == NULL){
2091
1808
fprintf_plus(stderr,
2092
1809
"Avahi: Failed to create simple poll object.\n");
2093
1810
exitcode = EX_UNAVAILABLE;
2157
1874
}
2158
1875
}
2159
1876
2160
/* If no interfaces were specified, make a list */
2161
if(mc.interfaces == NULL){
2162
struct dirent **direntries;
2163
/* Look for any good interfaces */
2164
ret = scandir(sys_class_net, &direntries, good_interface,
2165
alphasort);
2166
if(ret >= 1){
2167
/* Add all found interfaces to interfaces list */
2168
for(int i = 0; i < ret; ++i){
2169
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2170
direntries[i]->d_name);
2171
if(ret_errno != 0){
2172
errno = ret_errno;
2173
perror_plus("argz_add");
2174
continue;
2175
}
2176
if(debug){
2177
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2178
direntries[i]->d_name);
2179
}
2180
}
2181
free(direntries);
2182
} else {
2183
free(direntries);
2184
fprintf_plus(stderr, "Could not find a network interface\n");
2185
exitcode = EXIT_FAILURE;
2186
goto end;
2187
}
2188
}
2189
2190
/* Bring up interfaces which are down, and remove any "none"s */
2191
{
2192
char *interface = NULL;
2193
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2194
interface))){
2195
/* If interface name is "none", stop bringing up interfaces.
2196
Also remove all instances of "none" from the list */
2197
if(strcmp(interface, "none") == 0){
2198
argz_delete(&mc.interfaces, &mc.interfaces_size,
2199
interface);
2200
interface = NULL;
2201
while((interface = argz_next(mc.interfaces,
2202
mc.interfaces_size, interface))){
2203
if(strcmp(interface, "none") == 0){
2204
argz_delete(&mc.interfaces, &mc.interfaces_size,
2205
interface);
2206
interface = NULL;
1877
/* If the interface is down, bring it up */
1878
if(strcmp(interface, "none") != 0){
1879
if_index = (AvahiIfIndex) if_nametoindex(interface);
1880
if(if_index == 0){
1881
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1882
exitcode = EX_UNAVAILABLE;
1883
goto end;
1884
}
1885
1886
if(quit_now){
1887
goto end;
1888
}
1889
1890
/* Re-raise priviliges */
1891
errno = 0;
1892
ret = seteuid(0);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
1896
1897
#ifdef __linux__
1898
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1899
messages about the network interface to mess up the prompt */
1900
ret = klogctl(8, NULL, 5);
1901
bool restore_loglevel = true;
1902
if(ret == -1){
1903
restore_loglevel = false;
1904
perror_plus("klogctl");
1905
}
1906
#endif /* __linux__ */
1907
1908
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1909
if(sd < 0){
1910
perror_plus("socket");
1911
exitcode = EX_OSERR;
1912
#ifdef __linux__
1913
if(restore_loglevel){
1914
ret = klogctl(7, NULL, 0);
1915
if(ret == -1){
1916
perror_plus("klogctl");
1917
}
1918
}
1919
#endif /* __linux__ */
1920
/* Lower privileges */
1921
errno = 0;
1922
ret = seteuid(uid);
1923
if(ret == -1){
1924
perror_plus("seteuid");
1925
}
1926
goto end;
1927
}
1928
strcpy(network.ifr_name, interface);
1929
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1930
if(ret == -1){
1931
perror_plus("ioctl SIOCGIFFLAGS");
1932
#ifdef __linux__
1933
if(restore_loglevel){
1934
ret = klogctl(7, NULL, 0);
1935
if(ret == -1){
1936
perror_plus("klogctl");
1937
}
1938
}
1939
#endif /* __linux__ */
1940
exitcode = EX_OSERR;
1941
/* Lower privileges */
1942
errno = 0;
1943
ret = seteuid(uid);
1944
if(ret == -1){
1945
perror_plus("seteuid");
1946
}
1947
goto end;
1948
}
1949
if((network.ifr_flags & IFF_UP) == 0){
1950
network.ifr_flags |= IFF_UP;
1951
take_down_interface = true;
1952
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1953
if(ret == -1){
1954
take_down_interface = false;
1955
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1956
exitcode = EX_OSERR;
1957
#ifdef __linux__
1958
if(restore_loglevel){
1959
ret = klogctl(7, NULL, 0);
1960
if(ret == -1){
1961
perror_plus("klogctl");
2207
1962
}
2208
1963
}
1964
#endif /* __linux__ */
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1971
goto end;
1972
}
1973
}
1974
/* Sleep checking until interface is running.
1975
Check every 0.25s, up to total time of delay */
1976
for(int i=0; i < delay * 4; i++){
1977
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1978
if(ret == -1){
1979
perror_plus("ioctl SIOCGIFFLAGS");
1980
} else if(network.ifr_flags & IFF_RUNNING){
2209
1981
break;
2210
1982
}
2211
bool interface_was_up = interface_is_up(interface);
2212
ret = bring_up_interface(interface, delay);
2213
if(not interface_was_up){
2214
if(ret != 0){
2215
errno = ret;
2216
perror_plus("Failed to bring up interface");
2217
} else {
2218
ret_errno = argz_add(&interfaces_to_take_down,
2219
&interfaces_to_take_down_size,
2220
interface);
2221
if(ret_errno != 0){
2222
errno = ret_errno;
2223
perror_plus("argz_add");
2224
}
2225
}
2226
}
2227
}
2228
if(debug and (interfaces_to_take_down == NULL)){
2229
fprintf_plus(stderr, "No interfaces were brought up\n");
2230
}
2231
}
2232
2233
/* If we only got one interface, explicitly use only that one */
2234
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2235
if(debug){
2236
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2237
mc.interfaces);
2238
}
2239
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1983
struct timespec sleeptime = { .tv_nsec = 250000000 };
1984
ret = nanosleep(&sleeptime, NULL);
1985
if(ret == -1 and errno != EINTR){
1986
perror_plus("nanosleep");
1987
}
1988
}
1989
if(not take_down_interface){
1990
/* We won't need the socket anymore */
1991
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1992
if(ret == -1){
1993
perror_plus("close");
1994
}
1995
}
1996
#ifdef __linux__
1997
if(restore_loglevel){
1998
/* Restores kernel loglevel to default */
1999
ret = klogctl(7, NULL, 0);
2000
if(ret == -1){
2001
perror_plus("klogctl");
2002
}
2003
}
2004
#endif /* __linux__ */
2005
/* Lower privileges */
2006
errno = 0;
2007
/* Lower privileges */
2008
ret = seteuid(uid);
2009
if(ret == -1){
2010
perror_plus("seteuid");
2011
}
2240
2012
}
2241
2013
2242
2014
if(quit_now){
2243
2015
goto end;
2244
2016
}
2245
2017
2246
ret = init_gnutls_global(pubkey, seckey, &mc);
2018
ret = init_gnutls_global(pubkey, seckey);
2247
2019
if(ret == -1){
2248
2020
fprintf_plus(stderr, "init_gnutls_global failed\n");
2249
2021
exitcode = EX_UNAVAILABLE;
2266
2038
goto end;
2267
2039
}
2268
2040
2269
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2041
if(not init_gpgme(pubkey, seckey, tempdir)){
2270
2042
fprintf_plus(stderr, "init_gpgme failed\n");
2271
2043
exitcode = EX_UNAVAILABLE;
2272
2044
goto end;
2282
2054
/* Connect directly, do not use Zeroconf */
2283
2055
/* (Mainly meant for debugging) */
2284
2056
char *address = strrchr(connect_to, ':');
2285
2286
2057
if(address == NULL){
2287
2058
fprintf_plus(stderr, "No colon in address\n");
2288
2059
exitcode = EX_USAGE;
2293
2064
goto end;
2294
2065
}
2295
2066
2296
in_port_t port;
2067
uint16_t port;
2297
2068
errno = 0;
2298
2069
tmpmax = strtoimax(address+1, &tmp, 10);
2299
2070
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2300
or tmpmax != (in_port_t)tmpmax){
2071
or tmpmax != (uint16_t)tmpmax){
2301
2072
fprintf_plus(stderr, "Bad port number\n");
2302
2073
exitcode = EX_USAGE;
2303
2074
goto end;
2304
2075
}
2305
2076
2306
2077
if(quit_now){
2307
2078
goto end;
2308
2079
}
2309
2080
2310
port = (in_port_t)tmpmax;
2081
port = (uint16_t)tmpmax;
2311
2082
*address = '\0';
2312
2083
/* Colon in address indicates IPv6 */
2313
2084
int af;
2329
2100
}
2330
2101
2331
2102
while(not quit_now){
2332
ret = start_mandos_communication(address, port, if_index, af,
2333
&mc);
2103
ret = start_mandos_communication(address, port, if_index, af);
2334
2104
if(quit_now or ret == 0){
2335
2105
break;
2336
2106
}
2338
2108
fprintf_plus(stderr, "Retrying in %d seconds\n",
2339
2109
(int)retry_interval);
2340
2110
}
2341
sleep((unsigned int)retry_interval);
2111
sleep((int)retry_interval);
2342
2112
}
2343
2113
2344
2114
if (not quit_now){
2362
2132
config.publish_domain = 0;
2363
2133
2364
2134
/* Allocate a new server */
2365
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2366
&config, NULL, NULL, &ret_errno);
2135
mc.server = avahi_server_new(avahi_simple_poll_get
2136
(mc.simple_poll), &config, NULL,
2137
NULL, &error);
2367
2138
2368
2139
/* Free the Avahi configuration data */
2369
2140
avahi_server_config_free(&config);
2372
2143
/* Check if creating the Avahi server object succeeded */
2373
2144
if(mc.server == NULL){
2374
2145
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2375
avahi_strerror(ret_errno));
2146
avahi_strerror(error));
2376
2147
exitcode = EX_UNAVAILABLE;
2377
2148
goto end;
2378
2149
}
2384
2155
/* Create the Avahi service browser */
2385
2156
sb = avahi_s_service_browser_new(mc.server, if_index,
2386
2157
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2387
NULL, 0, browse_callback,
2388
(void *)&mc);
2158
NULL, 0, browse_callback, NULL);
2389
2159
if(sb == NULL){
2390
2160
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2391
2161
avahi_strerror(avahi_server_errno(mc.server)));
2403
2173
fprintf_plus(stderr, "Starting Avahi loop search\n");
2404
2174
}
2405
2175
2406
ret = avahi_loop_with_timeout(simple_poll,
2407
(int)(retry_interval * 1000), &mc);
2176
ret = avahi_loop_with_timeout(mc.simple_poll,
2177
(int)(retry_interval * 1000));
2408
2178
if(debug){
2409
2179
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2410
2180
(ret == 0) ? "successfully" : "with error");
2417
2187
}
2418
2188
2419
2189
/* Cleanup things */
2420
free(mc.interfaces);
2421
2422
2190
if(sb != NULL)
2423
2191
avahi_s_service_browser_free(sb);
2424
2192
2425
2193
if(mc.server != NULL)
2426
2194
avahi_server_free(mc.server);
2427
2195
2428
if(simple_poll != NULL)
2429
avahi_simple_poll_free(simple_poll);
2196
if(mc.simple_poll != NULL)
2197
avahi_simple_poll_free(mc.simple_poll);
2430
2198
2431
2199
if(gnutls_initialized){
2432
2200
gnutls_certificate_free_credentials(mc.cred);
2451
2219
2452
2220
/* Re-raise priviliges */
2453
2221
{
2454
raise_privileges();
2222
if(getuid() == 0){
2223
errno = 0;
2224
ret = seteuid(0);
2225
if(ret == -1){
2226
perror_plus("seteuid");
2227
}
2228
}
2455
2229
2456
2230
/* Run network hooks */
2457
run_network_hooks("stop", interfaces_hooks != NULL ?
2458
interfaces_hooks : "", delay);
2231
run_network_hooks("stop", interface, delay);
2459
2232
2460
/* Take down the network interfaces which were brought up */
2461
{
2462
char *interface = NULL;
2463
while((interface=argz_next(interfaces_to_take_down,
2464
interfaces_to_take_down_size,
2465
interface))){
2466
ret_errno = take_down_interface(interface);
2467
if(ret_errno != 0){
2468
errno = ret_errno;
2469
perror_plus("Failed to take down interface");
2233
/* Take down the network interface */
2234
if(take_down_interface and geteuid() == 0){
2235
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2236
if(ret == -1){
2237
perror_plus("ioctl SIOCGIFFLAGS");
2238
} else if(network.ifr_flags & IFF_UP){
2239
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2240
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2241
if(ret == -1){
2242
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2470
2243
}
2471
2244
}
2472
if(debug and (interfaces_to_take_down == NULL)){
2473
fprintf_plus(stderr, "No interfaces needed to be taken"
2474
" down\n");
2245
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2246
if(ret == -1){
2247
perror_plus("close");
2475
2248
}
2476
2249
}
2477
2478
lower_privileges_permanently();
2479
}
2480
2481
free(interfaces_to_take_down);
2482
free(interfaces_hooks);
2250
}
2251
if(getuid() == 0){
2252
/* Lower privileges permanently */
2253
errno = 0;
2254
ret = setuid(uid);
2255
if(ret == -1){
2256
perror_plus("setuid");
2257
}
2258
}
2483
2259
2484
2260
/* Removes the GPGME temp directory and all files inside */
2485
2261
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0